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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54f5a56e0008cc6667b8df8613a5713fcad3deffee148d226bd0bcd7e2d768c0' 
  AND token = 'ILglogcEmMTX0ub6YxBMzw4jXQPiQrPCGYbLjUB7EYc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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