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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b556adb52dd132a5a29a9c4b3e846d3e66bc148bf4d95d098ed4da7feb400f70' 
  AND token = 'wbQ1AS2yqH4aBbfDf7fILHl8dT4wKDu8DUzBgqhDua4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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