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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f595651aa2239da6f8a2f88374c931423ba81405ec07807af3f292ae2b242c3a' 
  AND token = 'zlsWcq69vTvizyBnhO3EyGJhYINf6U9KVOs8D6t63xE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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