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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f253e23e41f5dde979f25ea0ab94ef62de150f50109523eb12f01f440052ce76' 
  AND token = 'rHtcNUjCgx05YpCNdpxep9vFl8PU8JNJ1/wvJCqTgwE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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