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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec2bd53f4bc69304eb0d866294a6bc4061039ac6e1d32157a8640c4a817e4f95' 
  AND token = '2oYp/VVBed5Lzc7CIq9iD3eWENAZ7Ww+/mCUVlYurUk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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