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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98aa4ec2a207aa5659ebb4d5f09fc774297ec7c930c9b9e0e12fd45b801b3815' 
  AND token = 'hQqATsuFohWYf87qLxXRMBYQscp/n7YUJ8qktztPJKc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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