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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bf26df7783c43002677a746fd6df28054f515a9304f02dc67b55058f6984e02' 
  AND token = 'myq9aHgLVKEdiV6gsJF805WXwTQ9G4rH62oKcq/Ex3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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