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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f3321775d6c228d99583a39edd5c487a8dd836a67b82c278522fd6d67726360' 
  AND token = 'rLrs0+AUR+pYbYAMQRnp6GzebtO+d+wZLTSqycBrssw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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