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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb916916b1bd72e7bbf5885d6ec7d1fce12f11c07746dd31a1eeaa0b9a91bb92' 
  AND token = 'VI8pBFl5J9g/AEVJ1qoDlnxV0xAR0GLiZsRryIoFOVM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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