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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15ae556715200a5bc99d13d81a2391ba618a4c06357521f3eece6350783e840a' 
  AND token = '7jgT4/OI6B2sOHMRDzdkbtgnhEsvG/PCrknsafmbloo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}