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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e14520461a36ad86a3c2302567a391e292c6609995983e4058853d245c138e76' 
  AND token = 'kaqVVhm0P3rwDLS2MRaZQxVLQsehrqcYceGpevrsXzQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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