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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0b99106407ea50aa0e3d62ca5c32bfe0565d4e1eed7b490ac7a55b94e9b2902' 
  AND token = 'rzththydrUAT201elFLm+ALVjYZdW0eM01H1O7S9jaU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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