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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f51cfe70c2f185d274a8ae351e59245cdfddb9b8443593e3cfc189a4492a693d' 
  AND token = 'dFy3nxEdRN+PE6UAMwOBTw1+FCbixVLOx7TT0bn904o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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