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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd30568d2dd58b9b435e687e444714592fc13c12531785b9f40a98b37baa36b2d' 
  AND token = 'pnoiQuvpK8W0PsM+VDdMwc0tAMZjmW38N9n77i/xOO4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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