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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1d14b784a3c46b9b8889b0c951b5b52608871f872ace1cd2dc611801433c7b5' 
  AND token = 'YnLWQ1yevYQ0h94KYN6iIUE2dtCkGFdsx63sn4nlzzM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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