Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b97c51fa4c2a80fef221d822cc234e03ac09f431580e3b2f667f4c25ab1b3273' 
  AND token = 'dntbWvM011YJr1sgvlnUD8ivCyCjr0FpCZSx9xtEOAM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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