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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14bec28388529c670662ca04693c0174f273556c916a64c35ecb494f0f0f4a93' 
  AND token = 'a6f1imgqrzg6gp4K93M5zvYG3MwL/oW0NHPoQVftjQs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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