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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11197f415243cc8dc640a404f0170c6a90e8c7b878b5f411163e30e5d86ac28e' 
  AND token = 'vkiQEsg0QRsAAbFrwdzldI+RepMjeubDZkDSDltq5sI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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