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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbed209fe6564c6963065b2df60081a5f243e648f0aa288dcf9772a1f4bfb725' 
  AND token = 'd4tO0vqvBDPIbxgGdgQYZ04p8LXyCUlNDUuMe4gaoCk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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