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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd71f1b3bd4dcfcf1108a6fdb78027db7c494f2f4c3c47ec9640593d94cd1885d' 
  AND token = 'eMuOjsqIPj8ioVxkPFO/QdlMg8hTqY1NaIuheh/WhWw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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