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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5567ecb8f2817ab0d5e17a8cab2afaafed0e6865cab73d2616e14324d5188625' 
  AND token = 'qYvHA7FEg30Ufz8yRqf4PK1mg5uB49aDR9dnaBRpQag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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