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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab2ae0b81ac0c2e3b7d0733fc266ea43add5dc3a9615e84e72a4f1c2dae7bac5' 
  AND token = 'hpD84R5tmhYXqjE5fy2OtaGLohickKzYw23+q7d8hJo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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