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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a1998480871f87525b1c483f3354d2c7e1f6933b551afb12b8c1a8073e81abf' 
  AND token = 'XiDb+cnOix8UNhAhVzIK1WtZ2/yneC27B+wcG1s2trY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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