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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '859be8719cb3867fc5968ab4dc808126bfeeaf1114922f5f4723f63fb059cc22' 
  AND token = 'FlTHbPzyTWyDuV8zaexm09eMMMjQ1U7OtrY1qeuVXZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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