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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd24084cc7f9e79bb72a73f4e654b64cad2dc2f02031783fca4731f4126c75545' 
  AND token = 'R4ov931mjkYk8qpzbTXuOowfvjcXsi2bFki7Uydv7u4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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