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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd780aaf4e620badaf664b5c829106ca9b6e294f534e97617feddafb9cf85a4eb' 
  AND token = 'vXSJ3hKKcDj8p7+B7j1ojt3D8fitg1i+j+cQQ+04oDY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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