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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d62631071f15b83c9aebe7c1a4a0ddd1e097058708f85ced5a1804802f90a1a' 
  AND token = '3R6u4H0Yy7YoouxubVq56gf4CkQAEAZnokKDpYgbfW4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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