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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff8bec7baeeb08d0070896fd35974beef60a1222ca54dfcc2abf05196c7d5ea0' 
  AND token = '88J+UhC4xTXL0XRLJ+ZBu8bLeFjHOngjgEqr05Iuuik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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