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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b45260d0b4944477b458f951439d7e5704c91c3a9f4f6d40e1fca678f788f09' 
  AND token = 'FOapgh9xL7JbTayRTV15KtolCAMjSL9/qqwstNE8KWQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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