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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f66d0b8ac7f648bed4897f9e8e55f93e2bfb7fff7a919915eb4e576b30013df' 
  AND token = 'SbG2unlG+h0wwrwqfYNw1kQpxQxlCHTmL41uZJYiwCs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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