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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f715081ea4c93eca5b8bd22d27fc1874c5836ef6f577746f8d0b89fed35c7211' 
  AND token = '5fFgkWWM9cgIYm8ARECTPWK2U6Q1Vpjzkr9Nik0OfKw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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