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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a6394fc0eeed8a944b92b84e363e713b52585d6532c393f1dd9a599364f9675' 
  AND token = 'aj7EkCTSSS0ShUi5gXRx84nDXzL9EgMs0GE3kKW4nkQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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