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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8cd69e51bcd02566ecf9c1de562248d31dbd5bd6d669264e9b33626fecea5a9' 
  AND token = '2sMN9Z8ES9A5PLNrvX9USzTZclRlOg0/HyzmOBuKO/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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