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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15a3a5a0b802813cbb20d738133a4339519b162bba6d41c48f080d98762ea560' 
  AND token = 'gFwz04IfoQ8DZNTBrCfcI56tpm1vwuNgah2vtZ4ud7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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