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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b55d663f057d12e6094ab74c7179047d1473bee47f2e4b23e49423aee224fa1' 
  AND token = 'pGQtnYo3x3J4a5QCwgKQoXombxEoEaJk1LqytcjpugM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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