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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce71fa18bf3e8fa22741d451dcd8147d12466ec57906ea7a6ab3aebad462d4b8' 
  AND token = '16dlVNqzVt2SSHiAzSwLBoPMeClMI0GWfsAucKoQDto=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00109

JSON explain

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