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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cc5bec9dfde7c2f3c57fff789f22a1d2bd4853fc44bdb0eb959931ea6be6918' 
  AND token = 'aG3a9AOcsXt+QNtVjS1eaX+YQjVNx9wi1oOKFdknoVI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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