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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56c4dcd970dab405d60a00d5250603d0d6dd0b8ff455b7976f2988550d9cd0df' 
  AND token = 'ZAo0H9XcvMHXCOqC+wTCAXaoDy24+nVzacxdQ5oXil0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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