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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd7b080fcbb2ac0885581a3b9f76f6ee28f81b1b065e95c21b067738c7056fab' 
  AND token = 'yKbyUSsq3EDO7XKSjGF1C1enLNWQ6lJ0cVpWMgw+pYQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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