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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8770a89445c717a1a304c2534f44ac7407a91a521f9805972d4fac63ad78c3b3' 
  AND token = 'PvJ06NCux8iAU/ihltK8viUiJzCRbCpIPXXdeuxK52s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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