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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcd3cf6a4ec29f4e79bd306968e4aee1ca837ee7e3278054b6deaedfd1413f27' 
  AND token = 'GW92ookHDkgP0xoL6gMwLCGeAj8KCaZ2a/eArflcejI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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