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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1e859262310af6fc4cd8145f18d24c6cba2292710119e161d80d52e783459be' 
  AND token = 'iCT0gxlv+lTfTSu7nytc6BrQwIxYKMZDDN9T+AYHZak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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