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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8058ae8f5d6ea62ec8aa4c737ce7c4a1c5f6f16239a47cf30c73b0374365809b' 
  AND token = 'ZvB+2bbxvU2pz8LnDuSsUT4CAkvEAbbJMxEbWtrEARo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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