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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb57bd7234218c3c89555e27e60fe3332e9695459c73470ca58083eeaed77717' 
  AND token = 'd6JfUP7rUrrC723gnZiX8qHAmdGCNK7xw4dGnq84+lo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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