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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1fd0c03427ff4c1ff64f20be58b355006f38a9269446a05cb6a207efdf220fe' 
  AND token = '79VhjmA8QEaSlqRjYCzL0VNrKYUFRKB3KNEItL63Jnc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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