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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '759691fd67e754d2ba1d5b298f2c67894b6fc96d22509ff3e87ec7945c2b1298' 
  AND token = '7IPHw9+gQEtNtWFEsMafoAgkDQ5uSYQMTPv1EOZVcuw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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