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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ee7e9e3aaf294a87a8262019d2cd7ed93d12b966263b4d388972a0cdf4194d8' 
  AND token = '8ZKi5JZr14IprjFSlbhVOM3qWINcfPNP4WlvBnR8KQ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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