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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b819a2a4e0f06ad843624afc183337e9b4482a92bf4e2c3efb0f457217b03edf' 
  AND token = 'CMehHWkPuST9qsKhzPxENVOHzg4UcJ8VdrjOFy1rnTc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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