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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e13b45f08458aac036085db7902be960fa5d8d6b80e9d67e0d0fe4c47c130eff' 
  AND token = 'kwAZh18YGzbMoCx/BAEdBBriaTb5ltbBGa2Rgecy43w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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