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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82fb39862e5a9d37e90d92dbbb71498a7306096e0b29da46e4634c86c7156eab' 
  AND token = 'O+BLw3TChH3162oVybNcimTp6yuO0rq2rPOshXF40tc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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