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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1420cd85327e8f364dc3fd9df8e1d3f130837d4abba8d68c59837266c95224b' 
  AND token = '29XHydy4Lq8WPxB56nk2//ePkShcgQjO3o3Dh1RVv8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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