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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90206efc8d049c474617a794038c48ad307700b5f7847b84c63e25b16fe3b4a3' 
  AND token = 'JTUd7PINq/OSR/AZE96Jq5vCP35yrhrNG7Ecv2IHRBw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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