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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57dbf8a6d0338fbbbba9d841c3da421429104e1404cff24b0d5d00fe740fef7e' 
  AND token = 'egGM6LDSlJ9M2eHvbf21/pQaiMmRYSX98074e2PE4mg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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