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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea03260f1bba1ea9ffdfda8d8adfb997d6e614d91435480e994dbdf889250697' 
  AND token = 'CjUQY8ssCIywablUW3C6xN6h7Pplpo9YfojEMX1yoE0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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