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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5e4790fc158b8df1db383cd657aacb001d7626a9d42b5ed11ee3424733c51af' 
  AND token = 'YY7ejJyI/9v/NYDpNQ6DL/DZHC9Y9CaqgWsK12tULdA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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