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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07a292168be45e1c6a0c11bca8a03c7b75f200c04bd4977c56885c6e748c7f75' 
  AND token = '7hOlQ7twYCQM4rslY+OJLcSHlQMjXbr7hdF3MFQE0zA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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