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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e31a862e168230b14ab08fee524ca09e5bfdc7261bb4567c1c6407e6491ef4e' 
  AND token = 'scq+hEnBHw52RpRJJ/fjp7Ha86Pg46TCjgHXEsAyxMI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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