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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7645c314c481b70f9f1616ad906c253476e13d724ea759acd553d90d80542f7c' 
  AND token = 'YCsrrIbO0KbU7lkq/Fvkx3esVfqND2gOYThSIkB9Xpo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00076

JSON explain

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