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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f8bd82813730baafba5501ca7030c18a45884cff1a621e4f58860e8911fdd30' 
  AND token = 'MjrwAkPumAIo/6gciToAyWmdTH6u8REwBnYnjSdm0X8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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