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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77bcbca38d2a7aac4cf73844d0294dbace0ba1a0e62d070137d9060888ef2f0e' 
  AND token = 'csqSWjgIBLwIak49tqX4fm67PZKs1AgxOxRxWntEgTc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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